There's a fascinating new poll number out of South Carolina that tells you everything you need to know about where the politics of same-sex marriage in the country are headed and why Republicans need to be very careful with how they handle the issue in the coming years.

But, that such movement is happening in a state like South Carolina is both remarkable and politically telling. Remember that Mitt Romney won 55 percent in the 2012 presidential election and John McCain took 54 percent four years earlier. South Carolina has a Republican governor, a Republican controlled state legislature and two Republican senators, and six of its seven U.S. House seats are held by Republicans. The last Democrat to win South Carolina at the presidential level was Jimmy Carter in 1976.

Republicans, particularly those with an eye on a future national bid in 2016 or beyond, would do well to take note of the movement on gay marriage in South Carolina. While a Republican primary electorate -- like, say, for the state's first-in-the-South presidential primary in 2016 -- will still likely be strongly opposed to gay marriage, the simple fact is that the movement on the issue is all in one direction. And, for a party that currently finds itself struggling to build a national coalition in future presidential elections, this poll should be a wake-up call.

Chris Cillizza writes “The Fix,” a politics blog for the Washington Post. He also covers the White House.

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